[BC] FM Band other used for 19 kHz.

[nakayle@gmail.com]

  This reminds me of the terrible waste of using 25% of TV's modulation just
to transmit a sync pulse when modern sets could lock on far less.   In fact,
there no need to transmit a sync pulse at all now since it can be generated
internally in the TV using the color burst as reference. Many cable
descramblers do just this- regenerating missing sync that was removed in the
scramming process.  This would leave almost the whole envelope left for
video modulation greatly improving S/N.  Ofcourse all this will soon be mute
anyway as analog goes the way of the dinosaur.

On 1/18/06, DANA PUOPOLO <dpuopolo at usa.net> wrote:
>
> PLL stereo decoders (the ones used for the past 30 years - like the MC1310
> and
> LM1800) can lock onto as little as 4% pilot. If I had my say, pilot
> injection
> would be cut by 5% (to 5%) and the additional modulation used to increase
> program loudness.
>
> -D
>
>
>
> ------ Original Message ------
> Received: Wed, 18 Jan 2006 05:00:15 AM PST
> From: DHultsman5 at aol.com
> To: broadcast at radiolists.net
> Subject: Re: [BC]  FM Band  other used for 19 kHz.
>
> Ok  Brain trust  I have several questions.    What  can we technically use
> 10% of the FM signal at 19 kHz.  for other than  light the stereo light
> (not
> primary) and phase locking the 38 kHz. DSSB  suppressed carrier?
>
> I have heard several ideas in the past, Frequency shift keying
> for  data?  By
>
> adding a time constant to hold the receiver phase while the 19  kHz. is
> shifted + or -.
>
> I have heard discussion of amplititude modulating the 19 kHz. low response
> with no cut off below 2% modulation for telemetry tones.
>
> Since it was such a small amount of bandwidth and % of  modulation.
> Think
> about it.   It seems that we are wasting  10% modulation when the
> receivers
> could be locked with todays  technology.
>
> I doubt that it will ever be changed but  I wonder if you could
> do  something
>
> similiar to RBDS on the 19 kHz?
>
> Think out of the box.......Comments and ideas???
>
> Dave
>
> hanging out in Pittsburgh
>
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